#!/usr/bin/python
# -*- coding: UTF-8 -*-
# 例2：elif用法

num = 5
if num == 3:            # 判断num的值
    print('boss')
elif num == 2:
    print('user')
elif num == 1:
    print('worker')
elif num < 0:           # 值小于零时输出
    print('error')
else:
    print('passers-by')    # 条件均不成立时输出
